TITLE

Spectroscopy with multichannel correlation radiometers

AUTHOR(S)
Harris, A. I.
PUB. DATE
May 2005
SOURCE
Review of Scientific Instruments;May2005, Vol. 76 Issue 5, p054503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Correlation radiometers make true differential measurements in power with high accuracy and small systematic errors. This receiver architecture has been used in radio astronomy for measurements of continuum radiation for over 50 years; in this article, spectroscopy over broad bandwidths using correlation techniques is examined. After general discussions of correlation and the choice of hybrid phase experimental results from tests with a simple laboratory multichannel correlation radiometer are shown. Analysis of the effect of the input hybrid’s phase shows that a 90° hybrid is likely to be the best general choice for radio astronomy, depending on its amplitude match and phase flatness with frequency. The laboratory results verify that the combination of the correlation architecture and an analog lag correlator is an excellent method for spectroscopy over very wide bandwidths.
ACCESSION #
17023842

 

Related Articles

  • Absolute spectral sensitivity of linear-photodiode arrays in 7–20 keV energy x-ray range. Dolbnya, I. P.; Kurylo, S. G. // Review of Scientific Instruments;Jan1992, Vol. 63 Issue 1, p677 

    This paper deals with the study of the absolute spectral sensitivity of linear photodiode arrays (of LF1024-25/2 type) as x-ray one-coordinate detectors within the 7-20 keV energy range. The threshold sensitivity of such detectors was estimated in the indicated range. The measurements were made...

  • The parallel cylindrical mirror electron energy analyzer. Read, Frank H. // Review of Scientific Instruments;Mar2002, Vol. 73 Issue 3, p1129 

    An electrostatic energy analyzer is described that allows parallel acquisition of the energy spectrum of charged particles over a wide range of energies and over the complete range of azimuthal directions. The analyzer is similar to the cylindrical mirror analyzer except that a linear potential...

  • A differential-spectrum ion-energy analyzer with electrostatic slanted grids. Sakamoto, Y.; Cho, T.; Hirata, M.; Yoshimura, T.; Makino, K.; Nakashima, Y.; Yatsu, K.; Tamano, T.; Miyoshi, S. // Review of Scientific Instruments;Oct95, Vol. 66 Issue 10, p4928 

    Describes a differential-spectrum ion-energy analyzer with electrostatic slanted grids. Upgrading of a previous slanted grid end-loss analyzer (SELA) to essentially eliminate secondary-electron current; Provision of a differential-spectrum mode of operation; Characterization of SELA using...

  • Multispeckle diffusing-wave spectroscopy: A tool to study slow relaxation and time-dependent dynamics. Viasnoff, Virgile; Lequeux, Franc¸ois; Pine, D. J. // Review of Scientific Instruments;Jun2002, Vol. 73 Issue 6, p2336 

    A multispeckle technique for efficiently measuring correctly ensemble-averaged intensity autocorrelation functions of scattered light from nonergodic and/or nonstationary systems is described. The method employs a charge coupled device (CCD) camera as a multispeckle light detector and a...

  • Precision spectroscopy using the Lamb dip in a pure ion plasma. Barnes, P. N.; Hart, G. W. // Review of Scientific Instruments;Feb1993, Vol. 64 Issue 2, p579 

    The use of the Lamb dip as a technique for precision spectroscopy in a non-neutral plasma is explored through computer modeling. Using singly ionized magnesium as the ion and under typical pure ion plasma conditions, the measurement appears to be feasible. Under the conditions calculated here,...

  • Picosecond transient grating spectroscopy: The nature of the diffracted spectrum. Hogemann, Claudia; Pauchard, Marc; Vauthey, Eric // Review of Scientific Instruments;Oct96, Vol. 67 Issue 10, p3449 

    Reports on findings of a study of the nature of the diffracted spectrum obtained in picosecond transient grating (TG) spectroscopy with white light continuum. Use of the system to measure an aromatic molecule in solution; Analysis of diffracted spectrum using Kogelnik's coupled wave theory;...

  • Preparation of ultrathin free-standing targets for (e,2e) spectroscopy. Fang, Z.; Guo, X.; Utteridge, S.; Canney, S.A.; McCarthy, I.E; Vos, M.; Weigold, E. // Review of Scientific Instruments;Dec1997, Vol. 68 Issue 12, p4396 

    Describes the procedures used for the preparation of ultrathin free-standing membranes for spectroscopy. Importance of the development of radio frequency plasma source; Importance of a conducting sublayer in avoiding charging problem; description of a well prepared target.

  • On the temporal resolution of multitau digital correlators. Phillies, George D.J. // Review of Scientific Instruments;Oct96, Vol. 67 Issue 10, p3423 

    Studies the temporal resolution of multitau digital correlators. Variety of implementations of a multitau instrument; Average delay times; Consequences of correlator time resolution.

  • Comparison of Goodness of Fit Statistics for Linear Regression, Part I.  // Spectroscopy;Apr2004, Vol. 19 Issue 4, p38 

    Provides statistical tools described to compare and correlate two or more data sets. Software used for the pedagogical exercise; Assumptions made for performing linear regression computations; Use of linear regression as a statistical tool.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics